Drilling machine



Nov. 2 1926.

G. H. GILMAN DRILLING MACHINE Filed Jan. 10, 1920 4 Sheets-Sheet 1rlllllllll Inventor: gefl. ilinan, 22,, m r W cfliiys.

Nov. 2 1926.

G. H. GILMAN DRILLING MACHINE Filed Jan. 10, 1920 4 Sheets-Sheet 2 \0 MMbm Rub M Illa IA! .MJ

2 hm \mlm mm m. vm V w Inventor.-

jY. Gila nan,

Georg Nov. 2 1926.

G. H. GILMAN DRILLING MACHINE Filed Jan. 10. 1920 4 Sheets-Sheet 5 m HIm 4 "I! t w m 6 s l t 9 e h s 4 w Nmm Am. M G m New .mw Gw hm F a H mm.2 W hm N lnvewiov: George)! 6mm, bH 7 MW;

Patented Nov. 2, 1926.

UNITED STATES GEORGE H. GILMAN, OF BOSTON, MASSACHUSETTS.

DRILLING MACHINE.

Application filed January 10, 1920. Serial No. 350,677.

My invention relates to drilling machines and will be best understoodfrom the following description when read in the light of theaccompanying drawings of several specific embodiments of my inventionselected for illustrative purposes, while the scope of my invention willbe more particularly pointed out in the appended claims.

In the drawings:

Fig. 1 shows an elevation of one embodiment of my invention.

Fig. 2 shows an elevation at right angles to Fig. 1 and partial sectionon the line 2-2 of Fig. 1.

' Fig. 3 shows a section on theline 33 of F3 2.

Figs. 4, 5 and 6 respectively show sections on the lines 44, 55 and 66of Fig. 3.

Figf'? shows an elevation of a mounted hammer drill parts being shown insection,

and

Fig. 8 shows a section on the line 8-8 of Fi Ely invention is showninFigs. 1 to 6 as embodied in a hand hammer and in Figs. 7 and 8 isembodied in a mounted hammer drill. These machines generally speakingcomprise a hammer piston which is adapted to impart percussion to adrill steel, the latter being held in a. chuck rotated by a rotary fluidpressure motor provided with reduction gearing operatively connected tothe chuck. My invention althou h it compre; hends percussive tools isnot imited exclusively thereto and includes within its scope drillswhich cut by rotative action alone.

Referring particularlyto Figs. 1 to 6 I have illustrated a cylindermember 1 rovidedvwitha piston 2 reciprocated by uid pressure controlledby any suitable means,

and closing the front end of the cylinder a cylinder head 3 hereinformed seiaratel from the cylinder member and provi ed wit an extensionor sleeve 4 providing a reduced diameter portion for the cylinder withinwhich is received a striking pin 5'and the hammer bar 6 which serve totransmit the momentum of the pistofi 2 to the drillsteel.

It'will be understood by those skilled in this art that the striking pinmay be omitted and the hammer bar a one be used to transmit the momentumof the piston to the steel and in which case the hammer bar shown may belengthened approximately a distance equal 3 and the casing 10.

to the longitudinal dimension of the strikmg pm.

In this illustrative embodiment of my invention surrounding the sleevemember 4 of the cylinder is a casing 8 provided with a transverseportion 9 bearing on the sleeve and forwardly of the casing'8 is asecond casing 10 while rearwardly of the cylinder member is a rearcylinder head 11 which carries the handle 12, the arts just enumeratedbeing held in assembles relation by means of the side bolts 13 whichherein extend from the rear cylinder head 11 to the frontend of thecasing 10 as is clearly shown in Fig. 2. As illustrated the casing 8serves as the motor casing for the chuck rotating motor which hereincomprises the gear members 14, 15 and 16, and to house a reductiongearing hereinafter described, and further serves as a spacing meansbetween the cylinder head The casing 10 hereinafter termed the chuckcasing has mounted therein the forward portion of a chuck 17, said chuckas illustrated bein rovided with an enlarged portion 18 whic as abearing on the forward end of the sleeve portion4 of the cylinder.

In the articular embodiment of my invention illiistrated the gear member15 of the motor, which as shown is rotatably mounted on the sleeve 4,forms a rotary piston with which mesh the gear members 14 and 16,forming rotary abutments for this piston. Motive fluid, preferably comressed air, is supplied the motor by suitab e assages herein indicatedat 19 and 20, w ich passages communicate in any convenient manner withthe source of motive fluid supply for the machine and open into: theinterior of the casing 8 adjacent the points of intersection of the earmembers 14 and 16 with the gear memfier 15.

As illustrated the gear members 14 and 16, herein constituting rotaryabutments for the gear memberor rotary piston 16, are carried b shafts21 situated at opposite sides of the -s eeve member 4 in parallelismtherewith, t

ear members 14 and 16 being. illustrat ierein as secured innon-rotatable relation to the respective shafts 21 by keys 45 Fig. 2).

The shafts 21 are herein mounted in arings 22 and 23 respectivelysituated in the front cylinder head 8nd in the chuck casing 10, and asillustrated formed integrally with each shaft are pairs of eccentrics 24and 25 positioned approximately 180 apart as clearly indicated in Fig.2, which figure for convenience of illustration shows the eccentricsrotated around 90 from the position of the eccentrics in the otherfigures. As illustrated, connecting 0 posite eccentrics are a pair ofyokes 27 an 28 provided with cylindrical openings which adapt them tosurround the rearward portion 18 of the chuck the inner periphery of theopenings being provided with internal gear teeth 29 meshing with gearteeth 30 formed on the chuck. In order among other things to neutralizevibration I have herein rovided two yokes both of which are rovi ed withgear teeth meshing with the c uck, and the eccentrics are set withrelation to each other as above specified to give each yoke a gymtorymotion which at any given time moves one yoke in the opposite directionto the other. As the yokes gyrate the toothed portions thereof rollabout the toothed portion of the chuck and for one revolution of theteeth of the yoke the chuck is advanced a distance corresponding to thedifi'erence between the number of teeth on the respective parts therebyproviding a great speed reduction.

It will be observed from the foregoing description that I have providedfluid ressure actuated means for rotating the c uck comprising anannular gear mounted for gyratory movement.

In order to secure a compact arrangement in the submitted embodiment ofmy invention the shafts 21 are made hollow and surround the side bolts13. It will be noticed that the cylinder head 3 and the chuck casingform closures for the casing 8 which herein -forms the motor casing forthe chuck rotating motor and contains the reduction gearing, and thatthe bolts 13 act as securing means for holding these parts in assembledrelation.

It will be observed by comparison of Figs. 3, 4, 5 and 6 that in thesubmitted embodiment of my invention the motor, gearing, and cylindermember are each generally elliptical in outline, having their respectiveminor and major axes substantially in the same planes and having theircorresponding,

transverse dimensions or cross-sectional areas substantially embracedwithin the confines of the corresponding pro'ected dimensions orcross-sectional areas 0 each of the others. In other words, Figs. 4, 5,and 6 each show sections generally elliptical in outline and havingminor and major axes of substantially the same length, and illustrateparts which in the assembled rock drilling machine are organized incoaxial relation to each other in such manner that one is symmetricallysuperimposed upon the other, the cylinder, chuck, yokes, and motorherein in the assembled machine being in encircling relation to theaxial line of said cylinder. It will be understood that herein the yokcsmove about the axial line of the piston so that the yokes as operatingparts remain in substantially coaxial relation therewith, their majorand minor axes not deviating during such motion in marked degree fromthe planes defined b the corresponding major and minor axes 0 the motorand cylinder.

For many kinds of rock drilling reciprocating motors for rotating thechuck and mechanical means for the same purpose have provenunsatisfactory. To overcome the dif ficulties incident to these forms ofmechanism for rotating the chuck it has been proposed to employ anindependent rotary motor for the purpose, and heretofore in at temptingto solve this problem it has been found that a rotary motor whenorganized with the other parts of the machine creates a structure whichis so cumbersome and bulky that the machine can be used in confinedsituations, as for example close to a wall or in a cleft between rocks,only with extreme ,ditficulty, if at all. It will be observed that withmachines constructed according to the submitted embodiments of myinvention, as for example the hand hammer constructed according to Fig.1, these disadvantages of prior rock dri-lls employing independentmotors are eliminated by the employment of a rotary motor and reductiongearing, each of which is generallyof the same cross-sectional shape andsize as the cylinder and is coaxial t erewith, the motor and gearfurther being substantially annular to permit them to be compactlyarranged with the cylinder. It will further be observed that in thisembodiment of my invention I have provided flattened structures forhousing the motor andthe reduction gearing, and that the minortransverse dimension of these structures is substantially that of thecorres ondi dimension of that part of the cylin er WhlCl'l houses thelarge diameter portion, of the piston. In other words, it will beobserved that both the motor and reduction gearing are of such characterand shape as to permit them to be organized with the conventional formsof rock drills without forming a bulky structure, the rock drill, forexample that herein constructed according to Fi 1, being capable of usein substantially t e same restricted situations as if the motor andreduction gearing were omitted. At the same time thereduction gearingpossesses the merits of simplicity and ruggedness and can be organlzedwith the motor without undue complexity of transmission mechanism.

In the modification shown by Fi s. 7 and 8 my invention is shown as embied in a mounted drill comprising a cradle 40 provided with guide-ways41 and a feed screw 42 coacting with the nut 43 and serving to move thedrilling machine along the guides. In other respects this modificationis similar to that shown by Figs. 1 to 6.

It will be understood by those skilled" in the art that in commonpractice in drilling rock the drill steel is changed for every two tothree feet of advance of the drill hole, and as the drill hole isadvanced on the average of from 12 to inches per minute the drill steelin consequence must be changed frequently. It is therefore of importancein a mounted machine, such as is illustrated b Figs. 7 and 8, to formthe machine witli an absence of protuberanccs. which will revent readywithdrawal of the drill steel rom the drill -hole and insertion of a newdrill steel during the operation of changing drill steels. .In allmounted rock drills heretofore proposed in which a rotary chuck motor isprovided a bulky structure has resulted extending beyond the normalconfines of the dimensions of the cylinder as operative wholes havingeach a long and bod and with such machines the changing rill steels hasbeen rendered exceedingly diflicult, and especially when the motor hasbeen located at the front end of the machine. It will be appreciatedthat if the machine interferes with the withdrawal of the drill steelthe cradle must be moved in order to permit this operation, with theresult that the amount of rock drilled during a shift will be materiallydecreased. It will further be observed from Figs. 7 and 8 that I haveherein provided a mounted machine in which the motor and reduction gearpermit the hammer drill to be placed close to the feed screw and withoutformin a structure which will interfere with the rill steel during theoperation of changing drill steels.

Placing the hammer close to the feed screw minimlzes the stresses set upin the feed screw by the recoil of the hammer drill.

Although I have described several modifications of my invention it is tobe understood that within the scope of the appended claims the same issusceptible ,of other modifications without departing from the spiritthereof.

Claims 1. In a rock drill, a percussive motor comprising a cylindermember, a drill chuck, a chuck rotating motor comprising three mesh-'ing gear members arranged side "by side and acte upon by fluid pressure,reduction gearing comprising a gyratory member operatively connectinsaid motor and chuck, the middle gear mem r of said chuck rotating motorand said reduction gearing being axially aligned with said cylindermember, and said motor and reduction gearing being substantiallyembraced within the confines of the projected cross-sectional area ofsaid cylinder member.

2. In a rock drill, a percussive motor cylmember for gyrating indermember, a chuck, a chuck rotating motor comprising a plurality ofmeshinggear members acted upon by fluid pressure, gyratory reduction gearingsubstantially coaxial with said chuck operatively connecting said chuckand its rotating motor, said chuck rotating motor and gearing each beingcarried by said cylinder member, and/as operative wholes having each along and a short axis, the corresponding axes of each substantiallylying in the same longitudinal of said cylinder member.

'3. In a rock drill, a percussive motor cylinder member, a chuck, achuck rotating motor comprising three gear members acted so it upon byfluid pressure and lying diametri- I cally side by side, the middle gearmember of said motor being coaxial with said chuck, gyratory reductiongearing substantially coaxial with said chuck operatively connectingsaid chuck and said motor, said chuck rotating motor and gyratorygearing each being carried by said cylinder member and a shorttransverse axis. the corresponding axes of each substantially lying inthe same plane longitudinal of said cylinder member and the short axesbeing substantiallyembraced within the corresponding transversedimension of said cylinder.

4. In a rock drill, a cylinder, :1 reciprocatory fluid actuated hammerpiston in said cylinder, a chuck carried by said cylinder in rotatablerelation thereto, said chuck formed for caning a drill steel innon-rotatable relation th ereto, an internal gear surrounding saidchuck, external gear teeth carried by said chuck and meshing with saidinternal gear, eccentrics at opposite sides of said chuck, said internalear being mounted on said eccentrics and being gyrated thereby about theaxis of said chuck, a gear aligned with each eccentric and connected indriving relation thereto, a third gear coaxial with said hammer pistonand meshing with each of said first mentioned gears, a casing for saidgears forming therewith a rotary ex ansible chamber type motor, andmeans or admitting motive fluid-to said casing for operating said motor.

- 5. In a rock drill, a cylinder, a reciprocatory fluid actuated hammerpiston in said cylinder, a chuck carried by said cylinder in rotatablerelation thereto, said chuck formed for carrying a drill steel innonrotatable relation thereto, an annular series of gear teeth carriedby said chuck, a memberhaving asecond annular series of gear teetheccentric to 'and meshing with said series carried by saidchuck,eccentrics at opposite sides of said chuck carrying said said memberabout the axis of sald chuc a\gearaligned with each eccentric andconnected in driving re lati on thereto, a third gear coaxial with saida fluid actuated rotary member in the form of a ring mounted coaxiallywith said pismeshing with an yoke and chuck encirclin ton andsurrounding said percussive mechanism, eccentrics at opposite sides ofsaid chuck, means connecting said eccentrics to said motor for drivingthem in the same direction, said chuck carrying an annular series ofgear teeth coaxial] y arranged therewith, a member having an annularseries of gear teeth meshing with and eccentric to said annular seriescarried by said chuck, and said member being carried by said eccentricsand being gyrated thereby about the axis of said chuck.

7. In adrilling machine, a cylinder, a fluid actuated .hammer piston, achuck formed for carrying a drill steel, a fluid actuated chuck rotatingmotor delivering continuous uni-directional motion, reduction gearingconnecting said motor and chuck, said reduction aring comprisingagyratory yoke 'surroun ing said chuck and having an annular series ofgear teeth eccentric to and annular series of gear teeth operatlvelyconnected to said chuck, said the axial line of said iston, and said yoe gyrating about said e.

.8. 'In a drilling machine, a cylinder, er-' cussive mechanism .forforming the rill hole comprisin a hammer piston in said cylinder, a chucformed for can ing a drill steel, a fluid pressure operated luck rotatmgmotor comprising three meshing gear members arranged substantiallydiametrically side by side, the central one of said gear members beingin the form of a ring surrounding said percussive mechanism, andreduction gearing connectinglthe outside of said members to-said c uck.

9. a drilling machine, a, cylinder, a

hammer piston in said cylinder, a chuck formed for carrying a drillsteel, a fluid pressure 0 rated chuck cotating'motor commeshing gearmembers arranged substantially diametrically side-by side, reductiongearing comprising a gyratory oke surrounding said chuck and'operativ yconnecting one of the outside of said gar members to said chuck, saidyoke and e central one of said three gear members encircling the axialline of said piston, and said yoke gyrating about said line.

10. In a drilling machine, a cylinder, a hammer piston in said cylinder,a chuck formed for carrying a drill steel operated by said hammerpiston, a yoke having an annular portion through which said chuckextends, oppositely disposed eccentric members exteriorly of said chuckcarrying and adapted to gyrate said yoke about the axis of said chuck,shafts on which said eccentric members are mounted, means including amotor carried by said cylinder for driving said shafts in unison, and aspur gear connection between said annular portion of said yoke andchuck.

11. In a drilling machine, a cylinder, percussive mechanism for formingthe drill hole comprising a hammer piston, a chuck formed for carrying adrill steel, a yoke operaatively connected to said chuck and having anannular portion surrounding said percussive mechanism, oppositelydisposed eccentric members for gyrating said yoke, shafts at the side ofsaid machine and on which said eccentric members are mounted, means fordriving1 said shafts in unison comprising gear w eels mounted on saidshafts and an intermediate ear meshing with said first named gears, saidintermediate gear being coaxial with said iston and surrounding saidpercussive sure motor means for rotating said gears.

12. In a drilling machine, a cylinder carrying a hammer piston, a chuckformed for carrying a drill steel, a ring gear substantially alignedwith said chuck and rotatably supported relatively to said cylinder, ayoke surrounding said chuck and operatively connected thereto, a pair ofsmaller oppositely disposed gears meshing with said aligned gear, motormeans for rotating said gears, shafts ali ned with and driven by saidsecond mentioned gears, and means on said shafts for gyratin said yoke,said rin gear being substantial y coaxial with sai c linder and said.yoke encircling the axial hne of said cylinder.

13. In a drilling machine, a percussive motor comprising a cylinderhaving a front head structure, a chuck formed for carrying a drillsteel, said clutch supported in said front head structure for rotationrelatively to said cylinder, motor means for rotating said chuck, areduction gear for transmitting the motion of said motor to said chuckan comprisin a gyrating yoke housed 1n said front has structure, saidyoke having an annular portion geared to and encircling said chuck.

a 14. In a drilling. machine, a percussive motor comprising a cylinderhaving a front head structure, a motor havin' spaced rotary membershoused in said front ead structure, a chuck housed in-said front headstructure mec anism, and fluid presmoan:

and supported for rotation relativel to said cyllnder, a yoke housed insaid ront head structure and having an annular portion eccentric to theaxis of said cylinder, means driven by said rotary members for gyratingsaid yoke about the axis of said cylinder, and means for admittingmotive fluid to said head structure for operating said motor.

15. In a drilling machine, a ercussive motor cylinder member having arent head structure the minimum transverse dimension of which issubstantially that of the corresponding transverse dimension of saidcylinder, shafts in said front head structure at opposite sides thereof,eccentrics on said shafts, a yoke in said front head structure carriedby said eccentrics, a chuck surrounded by said yoke and operativelyconnected to said yoke, and motor means for rotating said shafts inunison.

16. In a drilling machine, a percussive motor cylinder, a front headstructure therefor, members securing said structure to said cylinder, achuck, a yoke for rotating the same, shafts mounted concentrically withsaid securing means, means on said shafts for rating the yoke, and meansfor rotating t e shafts.

17. In a drilling machine, a percussive motor cylinder, a front headstructure therefor, members securing said structure to said cylinder, achuck, a yoke for rotatin the same, and means mounted concentricallywith said securing members for gyrating the yoke.

.18. In a drilling machine, a percussive cylinder containin a hammerlston and having a cylinder ead, a chuck ormed for carrying a drillsteel, a chuck casing, a spacing member between said head and casing, achuck rotating motor and reduction gearing comprising a gyrating yokehaving an annular portion surrounding means for transmitting percussionto the b t of said drill steel, said motor and gearing being housed bysaid spacing member and said spacing member forming a motor casing forsaid motor, means for admitting motive fluid to said motor casing foroperating said motor, and means for securing said chuck casing-to said clinder.

19. In a dril ing machine, a percussive cylinder containin a hammeriston and having a cylinder ead, a chuck ormed for carrying a drillsteel, a chuck casing, 22. spacing member between said head and casing,means securing said chuck casing to said cylinder, agyratory yokeoperatively connected in driving relation to said chuck and having anannular portion surrounding means for imparting percussion to the bit ofsaid drill steel, said yoke being housed by said spacing member, a pairof eccentrics in said spacing member for gyrating said yoke, a motor insaid spacing member comprising a plurality of rotary members, and meansfor admitting motive fluid to said casing for driving said rotarymembers of said motor.

20. In a drilling machine, a casing, front and rear closures therefor,hearings in said closures supporting oppositely arranged shafts, meansfor rotatin said shafts, a yoke, means 0 erated by sald shafts forgyrating said yo (e, a chuck connected to said yoke, and securing meansfor said closures extending through said shafts.

21. In a drilling machine, a cylinder member, a cylinder head having anextension, a chuck, a chuck casing, said chuck havin an exterior bearingon said chuck casing and an interior bearing on said extension, aspacing member between said head and chuck casing, means for securingsaid chuck casing to said cylinder member, a motor and reduction gearingfor rotating the chuck, and said motor and gearing being housed by saidspacmg mem er. r

22. In a drilling machine, a cylinder, a cylinder head having anextension, a geared member surrounding said extension, :1 chuck, saidchuck having a bearing on said extension, driving mechanism between saidgeared member and chuck comprising a second eared member located at theside of said first mentioned geared member and in mesh therewith, and agyratory yoke surroundin said extension and driven by said secondmentioned geared member.

23. In a drilling machine, acylinder, :1 cylinder head having anextension, a geared member surrounding said extension a chuck, drivingmechanism between said geared member and chuck comprising a secondgeared member located at the side of said rst mentioned geared memberand in mesh therewith, and a gyratory yoke having an annular portionsurrounding said chuck and driven by said second mentioned gearedmember.

24. In a drilling machine, a c linder, a hammer piston having a hammerar a'cylinder head having an extension, said hammer bar adapted to entersaid extension, a fluid pressure operated motor membersurrounding saidextension and mounted for rotation, at chuck, and earin adapted toconnect said motor mem er and chuck comprising a gyratory annular gearsurroundmg said extension. v

25. -In a drilling machine, a support, a percussive motor slidablymounted on said support, said percussive motor having a cylinderrelatively close to said support, a chuck, reduction gearing comprisinga gyratory gear operatively connected to said chuck, said gyratory gearibeing aligned with said cylinder and aving a transverse dimensionrelatively longer than the transverse dimension at right angles thereto,said longer dimension being substantially parallel to the plane of thesupport, and means for moving said percussive motor along the support.

26. A drilling machine having in combination, a fluid operated hammerdrill comprising a casing in which is mounted a reciprocatory hammerpiston and a rotary chuck formed for carrying a drill steel, a mountingfor said casing having longitudinally extending guides supporting saidcasing in relatively close relation thereto for longitudinal feedingmovement. a motor and reduction gearing for rotating said chuck, saidmotor and reduction gearing being housed by said casing, said motorhaving three meshing gears arranged diametrically side by side ondiameters in a plane parallel to the plane of said guides, the centralgear being coaxial with said casing, eccentrics aligned with and drivenby the outer two of said three gears, an annular member mounted on saideccentrics and gyrated thereby about the axis of said casing, and a gearconnection between said annular member and chuck.

27. A drilling machine having in combination, a fluid operated hammerdrill comprising a casing in which is mounted a reeiprocatory hammerpiston and a rotary chuck formed for carrying a drill steel, a mountingfor said casing having longitudinally extending guides supporting saidcasing in relatively close relation thereto for longitudinal feedingmovement, a feed screw relatively close to said casing for moving saidcasing along said guides, 11 motor and reduction gearing for rotatingsaid chuck, said motor and reduction gearing being housed by saidcasing, said motor having three meshing gears arranged diametricallyside by side on diameters in a plane parallel to the plane of said ides,the central gear being coaxial with said casing, eccentrics aligned withand driven by the outer two of said three gears, an annular membermounted on said eccentrics and gyrated thereby about the axis of saidcasmg, and a gear connection between said annular member and chuck.

28. In a rock drill, a cylinder, a piston in said cylinder having ahammer bar, a chuck, a chuck rotating motor comprising an annular rotarymember actuated by fluid pressure positioned to surround said hammer barin at least one position of the piston, an annular casing. for said rotamember, means for admitting pressure Hard to said casing for effectingrotation of said rotary member, means comprising an annular gyratorygear for operatively connecting said rotary member to said chuck; saidrotary member being substantially coaxial with said piston and saidgyratory gearencircling and gyrating aboutv the axial line of saidpiston, and means for securing said casing tosaid cylinder.

29. In a drilling machine. a piston having a larger and a smallerdiameter portion, means forming a casing for said piston, said casinghaving a smaller and larger diaircter portion, a chuck. a motor fordriving -said chuck and comprising a rotary member operated upon byfluid pressure and surrounding said smaller diameter por tion of saidcasing, a reduction gear for driving said chuck comprising an annulargear gyrated by said motor about the axis of said rotary member, saidrotary member and annular gear encircling the axial line of said piston.

30. In a drilling machine, a piston having a larger and a smallerdiameter portion, means forming a casing for said piston, said casinghaving smaller and larger diameter ortions, a chuck, a motor for drivingsaic chuck and having a pair of meshing rotary gears operated upon byfluid pressure one of which surrounds the smaller diameter portion ofsaid casing, and a reduction gearing operatively connect-ed to the otherof said rotary gears and comprising an annular gear; said rotary gearwhich surrounds said casing and said annular gear both encircling theaxial line of said piston.

31. In a rock drill, a cylinder, a hammer piston in said cylinder, arotary chuck formed for carrying a drill steel, a gear coaxial with saidpiston, relatively smaller gears meshing with said first named gear,eccentrics aligned with and driven by said smaller gears, a yoke fordriving said chuck and having an annular portion surrounding the.

axis of said cylinder, said yoke being mounted on said eccentrics, thethree meshing gears having their axes in a. plane corresponding to themedian position of the major axis of said yoke, and the minor axis ofsaid yoke and said gear coaxial with said piston being embraced in themajor projected cross-sectional area of said cy1- inder.

32. A rock drill having in combination, a casing, a hammer pistonreciprocably mounted in said casing, a chuck formed for carrying a drillsteel and being rotatably mounted in said casing, fluid ressure actuatedmeans for rotating said c iuck comprising a yoke surrounding therearward end of said c iuck, means including an eccentric. for

efiecting gyratory motion of said yoke, and internal gear teeth on saidyoke meshing with gear teeth on said chuck.

33. A rock drill having in combination, a casing, a hammer pistonreciprocably mounted in said casing, a chuck formed for carrying a drillsteel and being rotatable relatively to said casing, fluid pressureactuated means for rotating said chuck comcasing, a

prising a yoke mounted for gyratory movementand carrying an annularseries of gear teeth eccentrically to the axis of said chuck, and asecond annular series of gear teeth in operative relation to said chuckfor driving said chuck and meshing with the first mentioned annularseries of gear teeth.

34. A rock drillhaving in combination, a hammer piston reciprocablymounted in said casing, a chuck formed for carrying a drill steel andbeing rotatable relatively to said casing, fluid pressure actuated meansfor rotating said chuck comprising a yoke mounted on a plurality ofspaced eccentrics for gyrating movement and carrying an annular seriesof gear teeth eccentrically to the axis of said chuck, and a secondannular series of gear teeth in operative relation to said chuck fordriving said chuck and meshing with the first mentioned annular seriesof gear teeth.

35. A rock. drill having in combination, a casing,- a hammer pistonreciprocably mounted in said casing, a chuck formed for car ing a drillsteel, said chuck being rotata le relative to said casing, fluidpressure actuated means for rotating said chuck comprising an annulargear mounted for gyra tory movement and having an annular series of gearteeth eccentric to the axis of said chuck, a second annular series ofgear teeth in operative relation to said chuck for driving the latterand meshing with the first mentioned series of gear teeth, said annulargear and chuck encircling the axial line of said piston, and said geargyrating about said line.

36. A rock drill having in combination, a casing, a hammer pistonreciprocably mounted in said casing, a chuck formed for carrying a.drill steel, said chuck being rotatable relative to said casing, motorand reduction gearing means actuated by fluid pressure for driving saidchuck comprising an annular member mounted for gyratory movement, saidannular member and said chuck encircling the axial line of said piston,and said gear gyrating'about said line.

37. In a drilling machine, a cylinder, a chuck formed for carrying adrill steel, fluid actuated percussive means within said cylinder foroperating said steel, said chuck mounted for rotation relatively to saidcylinder, reduction gearing including a gymtory gear for driving saidchuck, said gear with respect to its axis of movement being coaxial withsaid chuck, a fluid actuated rotary motor comprising a gear membersurrounding said cylinder and a second gear member located at the sideof said cylinder and meshing with said first gear member, and drivingmeans for said gyratory gear at the side of said cylinder operativelycon meeting said second mentioned gear member to said reduction gearing.

38. In a drilling machine, a cylinder, a chuck formed for carrying adrillsteel, fluid actuated percussive means within said cylinder foroperating said steel, reduction gearing comprising a gyratory gear fordriving said chuck, said gear with respect to its axis of movement beingcoaxial with said chuck, a rotary motor comprising a gear membersurrounding said cylinder, a plurality of gear members at the side ofsaid cylinder and meshing with said first mentioned gear member, anddriving means operatively connecting one of said last mentioned gearmembers to said gyratory gear comprising an eccentric for effectinggyration of said gyratory gear.

39. In a drilling machine, a cylinder, a chuck formed for carrying adrill steel, fluid actuated percussive means within the cylinder foroperating said steel, said chuck journalled on said cylinder, a fluidactuated rotary motor surrounding said cylinder and comprising a memberjournalled on said cylinder, and reduction gearing connecting said motorand chuck for rotating the latter, said reduction gearing comprising agyrating yoke geared to said chuck and surrounding said cylinder..-- r

40. In a drilling machine, a cylinder, a chuck 'formed for carrying adrill steel, fluid actuated percussive means within said cylinder foroperating said steel, a gear carried by said chuck, a rotary motorcomprising a rotary member actuated by fluid pressure and surroundingsaid cylinder, a second rotary member at the side of said cylinderoperatively connected in driving relation to the first mentioned rotarymember, and reduction gearing for connecting said second rotary memberto said chuck comprising a gyrating yoke surrounding the cylinder andhaving gear teeth meshing with said first mentioned gear.

41. In a drilling machine, a cylinder, a chuck formed for carrying adrill steel, a gear for said chuck, fluid actuated percussive meanswithin said cylinder for operating said steel, a rotary motor comprisinga gear member surrounding said cylinder and journalled thereon and aplurality of gear members at the side of said cylinder, a gyrating yokesurrounding said cylinder, means including a pair of eccentrics' drivenby the side gear members for gyrating said yoke, and said yoke having agear meshing with said ear for said chuck. 42. In a percussive rillingmachine, a cylinder member, a hammer piston in said cylinder, a chuckformed for carrying a drill steel actuated by said hammer piston, saidchuck supported in rotatable relation to said cylinder, a fluid pressuremotor for rotating said chuck, said motor having an annular memberprovided with gear teeth and a second member rovided with gear teeth,the ar teeth ot said several members meshing, said annular member andsaid chuck surrounding said cylinder, reduction gearing connecting saidmotor and chuck, said reduction gearing comprising an annular gear,surrounding said cylinder, an eccentric driven by said motor forgyrating said annular gear, and casings for said motor and gearingsurrounding said cylinder and being supported in non-rotatable relationthereto.

43. In a percussive drilling machine, a cylinder member, a hammer pistonin said cylinder, a chuck formed for carrying a drill steel actuated bysaid hammer piston, said chuck supported in rotatable relation to saidcylinder, a fluid pressure motor for rotating said chuck, said motorhaving an annular member provided with gear teeth and a second memberrovided with gear teeth, the gear teeth 0 said several members meshing,said annular member and said chuck surrounding said cylinder, reductiongearing connecting said motor and chuck, said reduction gearingcomprising an eccentric driven by said second member and an annular geargyrated by said eccentric, and a casing for said motor and gearingsurrounding said cylinder and being supported in non-rotatable relationthereto.

44. In a drilling machine, a chuck formed for carrying a drill steel,-apercussive cylinder, a hammer piston in said cylinder for operating saidsteel, a pair of intermcshing gear members located at the side of andparallel to said cylinder, a casing for said gear members, means foradmitting motive fluid to said casing and causing it to act upon and torotate said gear members, said chuck being rotatable relative to saidcylinder, and a reduction gearing for operatively gonnecting said chuckand said gear memers.

45. In a. rock drill, a cylinder, a hammer piston in said cylinder, achuck formed for carrying a drill steel operated by said hammer piston,said chuck having a rear wardl extending sleeve surrounding said cyliner, external gear teeth carried by said chuck, a gear surrounding saidcylinder and meshing with a gear at theside of said cylinder, aneccentric at the side of said cylinder driven by said ear at the side ofsaid cylinder, and a yo ecarry' internal gear teeth surrounding'saidcyhnder and meshing with said external gear teeth carried by saidchuck.

In testimony whereof, I have signed my name to this specification.

GEORGE H. GILMAN.

and a second member rovided with gear teeth, the gear teeth of saidseveral members meshing, said annular member and said chuck surroundingsaid cylinder, reduction gearing connecting said motor and chuck, saidreduction gearing comprising an annular gear surrounding said cylinder,an eccentric driven by said motor for gyrating said annular gear, andcasings for said motor and gearing surrounding said cyl1nder and beingsupported in non-rotatable relation thereto.

43. In a percussive drilling machine, a cylinder member, a hammer pistonin said cylinder, a chuck formed for carrying a drill steel actuated bysaid hammer piston, said chuck supported in rotatable relation to saidcylinder, a fluid pressure motor for rotating said chuck, said motorhaving an annular member provided with gear teeth and a second memberrovided with gear teeth, the gear teeth 0? said several members meshing,said annular member and said chuck surrounding said cylinder, reductiongearing connecting said motor and chuck, said reduction gearingcomprising an eccentric driven by said second member and an annular geargyrated by said eccentric, and a casing for said motor and gearingsurrounding said cylinder and being supported in non-rotatable relationthereto.

44. In a drilling machine, a chuck formed for carrying a drill steel, apercussive cylinder, a hammer piston in said cylinder for operating saidsteel, :1 pair of internieshing gear members located at the side of andparallel to said cylinder, a casing for said gear members, means foradmitting motive fluid to said casing and causing it to act upon and torotate said gear members, said chuck being rotatable relative to saidcylinder, and a reduction gearing for operatively (trlonnecting saidchuck and said gear memers.

-15. In a rock drill, a cylinder, a hammer piston in said cylinder, atchuck formed for carrying a drill steel operated by said hammer piston,said chuck having a rearwardly extending sleeve surrounding saidcylinder, external gear teeth carried by said chuck, a gear surroundingsaid cylinder and meshing with a gear at theside of said cylinder, aneccentric at the side of said cylinder driven by said gear at the sideof said cylinder, and a yoke carrying internal gear teeth surroundingsaid cylinder and meshing with said external gear teeth carried by saidchuck.

In testimony whereof, I have signed my name to this specification.

GEORGE H. GILMAN.

Certificate of Correction.

It is hereby certified that in Letters Patent No. 1,605,712,

November 2,

anted 1926, upon'the application of George H. Gilman, of Boston, 'finmchusetts for an improvement in Drilling Machines, errors appear in thepainted specification requiring correction as followszPage 2, line 64,strike out the word and comma cy1inder,; page 3 line 76, after the wordsame the said Letters Patent should be read with these insert theword'plaow; and that corrections therein that. the same mag conform tothe record of the case in the Patent Ofiice; igned and sealed this 4thday of January, A. D. 1927.

[sun] M. J; MOORE, Acting Commissioner of Pate/nit.

Certificate of Correction.

It is hereby certified that in Letters Patent No. 1,605,712, antedNovember 2, 1926, upon the ap lication of George H. Gilman, of Boston,usetts, for an improvement in Drilling ,Maehines, errors appear in theprinted specification requiring correction as follows: Page 2, line 64,strike outthe word and comma cylinder,; page 3 line 76, after the wordsame insert the word plane; and that the said Letters Patent should beread with these corrections therein that the same ma. conform to therecord of the case in the Patent Oflice;

igned and sealed this 4th day of January, A. D. 1927.

[HEAL] M. J. MOORE,

Airting Oommiuimaer 0/ PM.

